Gnomon Copy (617-491-1111) is willing to clear copyrights, and create and sell your course pack for you. Selections from books are restricted to 10% of the book. Many faculty find it easier to provide PDFs of course material on their course web pages, eliminating the need for a course pack.  In either event, it is important to begin the process early.  See Deborah De Laurell (deborahd@wjh.harvard.edu) for more detailed information on course pack preparation.